[issue20167] Exception on IDLE closing

[Terry J. Reedy]

Terry J. Reedy added the comment:

I checked that -m idlelib acts the same as -m idlelib.idle, and that there is still a problem after opening a second editor window after the original. So the messages seem tied to not opening a shell window. In testing the patch, I noticed that exceptions are now occurring in all three .__del__ methods. With the candidate release imminent, I decided to only fix what is broken and only apply to 3.4 and not worry now about possible merge problems in the future.

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assignee:  -> terry.reedy

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